Long-bit-tool holder



G. W. DOVER..

LONG BIT TOOL HOLDER.

APPLICATION HLED MAY 4, 1920.

1,356,609. Patented 001126, 1920.

E 28 25 Hg. 2.

20 a\ as \NVENTOR (a; 26mm 55 ATTORQEX UNITED STATES P T T OFFICE.

GEORGE W. DOVER, 0F CRANSTON, RHODE ISLAND.

none-srrroon HOLDER.

- post of a lathe planer or other machine.

The essential objects of my invention are 'to afford accommodation forbits of unusual length; to apply the clamping pressure of the holdingbars to that portion of the bit upon which the greatest strain occurs;to direct the bit horizontally to the work rather than at an incline tothe holder whereby the hit points directly to the cen ter without theassistance of the tool post rocker, thus insuring less grinding toattain the desired result ;.,to clamp the bit at a point relativelyclose to where the work is taking place; and to attain these ends in asimple and inexpensive structure.

To the above and related ends my invention consists in such parts and insuch com binations of parts as fall within the scope of the appendedclaims.

In the accompanying drawings which form a part of this specification 1Figures 1, 2, and 3, are a side elevation, a plan view, and an end viewrespectively of my novel holder, and

Fig. 4, a section of the same on line 4-4 of Fig. 1.

' Like reference characters indicate like parts throughout the views.

In detail my holder comprises two bars 6 of similar form and dimensions,rectangular in cross section, and comprising shanks 7 and laterallycurved enlarged portions or heads 8 adjacent the ends. The

. bars when no bit is mountedtherein', rest one against the other andhave upon their contiguous faces longitudinally disposed rectangularchannels 10 extending throughout their length. Both heads 8 are concentrically bored to form holes 12 and 13 respectively of uniform diameter.

A stud is provided for clamping the bars comprising a cylindrical head18 slidable V Specification of Letters Patent.

Application-filed. May 4, 1920. Serial No. 378,882.

' restin with the bit results.

Patented 0a. 26, 1920.

in the holes 12 and 13 provided on one end with a circular head 19abutting against the outer face of one bar, and having upon its oppositeend a'stem 20 of reduced diam- I' eter provided with a thread 21. Uponthe stem 20 is a nut 25 engaging a washer 26 upon the outer face of theadjacent bar. For the accommodation of the bit 28 there is provided inthe body a diametrically disposed passage 30 which is of suflicientlygreater dimensions to insure that the bit shall not contact with thebody.

This passage is therefore solely for clearance.

In use the bit is clamped between the bars, and rests in thechannels 10.The clamping isefi'e'cted by turning the nut 25.

The relatively greater bearing area of the bars at their head portionsaffords increased strength at that point, and the location of thebinding'means in the end of the bars adjacent the working end of the bitis inthe best position for sustaining the The structure of strain uponthe holder.

the stud is inexpensive, does not touch the V bit, and is particularlyeffective. An extremely firm interengagement of the bars I claim 1. In atool'holder of the character described, elongated clamping barsprovided.

with longitudinally disposed channels upon their adjacent faces adaptedto embrace a bit, a stud loosely mounted in the bars pr0- vided with aclearance opening to permit the passage of the bit, and means on the 1stud embracing the bars for clamping the bars upon the bit.

2. In a tool holder of the character deheads provided with a clearanceopening for the bit, and a clamping nut carried by the stud.

In testimony whereof I have aifixedmy signature. GEORGE W. DOVER.

